Abstract
The lifetime and the intensity of ortho-positronium (o-Ps), τ3 and I3 respectively, were measured for polyimides and non-imide polymers in glassy state. Average size of free space holes probed by o-Ps, vh,Ps is calculated from τ3 using an empirical equation. Correlations between sorption of CO2 and the positron annihilation (PA) properties are discussed. The Langmuir capacity constant CH′ of the dual-mode sorption model is well correlated with vh,Ps, suggesting that the larger vh,Ps, reflects the higher volume fraction of holes large enough to be available for the Langmuir type sorption. The Henry’s law solubility constant kD is also correlated with vh,Ps, indicating that the polymers packed less-efficiently tend to have larger kD. As a result, there is a tendency that solubility coefficient of CO2 at 10 atm, SCO2, increases with vh,Ps. The CH′, kD, and SCO2, are also correlated with vh,PsI3 for only the polyimides, and the correlations are a little worse than those with vh,Ps.
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Tanaka, K., Okamoto, Ki., Kita, H. et al. Correlation between Positron Annihilation and Sorption of CO2 in Glassy Polymers. Polym J 25, 577–584 (1993). https://doi.org/10.1295/polymj.25.577
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DOI: https://doi.org/10.1295/polymj.25.577
